104 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



" Animal yellow, foot dull grey, head and tentacles dark brown. 

 Peristome of every colour from pure white to deep violet. 



Hab. — On plantain and coconut stems in the low-lying districts 

 of the S.W. Province, Sea level." 



(b) Yar. " Animal rich nut-brown colour all over, tentacles 

 a little paler with yellow bulbs. Peristome always rose colour." 



Hab. — Same as the preceding. 



(e) Var. melanotragus (Born). " Animal greyish-yellow, foot grey, 

 head and tentacles greyish-brown. Peristome usually black, but often 

 varied with a blotch of pale lilac or white. 



Hab. — On coconut and papan trees (Carica papya, Linn.) in the 

 Galle district, S. Province, Ceylon." 



So far as the anatomy of these varieties is concerned, they do not 

 differ from each other except in the number of teeth in a transverse 

 row of the radula, and, very slightly, in the shape of the individual 

 teeth. 



2. ACAVUS PHOENIX (Pfl\). 



(a) Type. "Animal large, coarsely tubercnlated, very dark brown 

 colour all over, including the tentacles and bulbs. Peristome black, 

 dark brown, or white. 



Ilab. — On coconut palms in low-lying maritime districts, sea level." 



(b) Far. " Animal light golden brown all over, head a little 

 darker, tentacles golden. Aperture of the shell relatively small. 

 Peristome very variable, but commonly black. 



Ilab.— On areca palms in Kandy hill-districts ( 1 500-2000 ft.). Not 

 found in maritime parts. The shells of these animals have hitherto 

 been known as varieties of A. phoenix ; but the latter is exclusively 

 a maritime low-country shell, and the animals are very different." 



Mr. Collett seems to regard this form as a distinct species rather 

 than a mere variety of A. phoenix. From a careful comparison of the 

 anatomy of this form with that of a typical A. phoenix, thei'e does not 

 appear to be adequate grounds for regarding it as other than a mere 

 variety thereof. The radula is of the same type, and the number 

 of teeth in a transverse row fall within the limits of variation which 

 may be assigned to A. phoenix (see p. 107). 



Moreover, the internal structure of the penis is identically the same 

 as that of a typical A. phoenix. 



3. ACAVUS SUPERBTJS (Pfr.). 



(a) Type. "Animal chocolate, with orange bulbs and tentacles. 

 Peristome white with chestnut margin. 



Hab. — On mango and jak trees, high up on the trunk, in clamp 

 shady places. Near the village of Arslena (2000 ft.)." 



(b) Yar. Grevillei (Pfr.). "Animal light chocolate colour with 

 orange bulbs and tentacles. Peristome black, shell with a rosy apex. 



Ilab. — On areca palms with A. superbus var. roseolabiata. Lower 

 Ambagamuwa (2000 ft.)." 



